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The origin of the Galactic halo stellar structure known as the Monoceros ringis still under debate. In this work, we study that halo substructure using deepCFHT wide-field photometry obtained for the globular clusters NGC2419 andKoposov2, where the presence of Monoceros becomes significant because of theircoincident projected position. Using Sloan Digital Sky Survey photometry andspectroscopy in the area surrounding these globulars and beyond, where the sameMonoceros population is detected, we conclude that a second feature, not likelyto be associated with Milky Way disk stars along the line-of-sight, is presentas foreground population. Our analysis suggests that the Monoceros ring mightbe composed of an old stellar population of age t ~ 9Gyr and a new component ~4Gyr younger at the same heliocentric distance. Alternatively, this detectionmight be associated with a second wrap of Monoceros in that direction of thesky and also indicate a metallicity spread in the ring. The detection of such alow-density feature in other sections of this halo substructure will shed lighton its nature.

astrophysical journal/the astrophysical journal

A Megacam Survey of Outer Halo Satellites. IV. Two foreground  populations possibly associated with the Monoceros substructure in the  direction of NGC2419 and Koposov2